Ensue

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late Middle English (formerly also as insue ): from Old French ensivre, from Latin insequi, based on sequi ‘follow’.

wiktionary

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From Old Frenchensu- [1], stem of some conjugated forms of ensivre(“follow close upon, come afterward”) (French ensuivre), from Latin īnsequere, from īnsequi(“to pursue, follow, follow after; come next”), from in-(“upon”) (see in-) + sequi(“follow”) (see sequel).

etymonline

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ensue (v.)

c. 1400, "seek after, pursue; follow (a path)," from Old French ensu-, past participle stem of ensivre "follow close upon, come afterward," from Late Latin insequere, from Latin insequi "to pursue, follow, follow after; come next," from in- "upon" (from PIE root *en "in") + sequi "follow" (from PIE root *sekw- (1) "to follow"). Early 15c. as "follow (as a consequence), to result;" mid-15c. as "to follow" in time or space, "to come or appear next, be subsequent to, happen subsequently." Related: Ensued; ensues; ensuing.